A:NF3是氧化剂,H2O是还原剂
B:还原剂与氧化剂的物质的量之比为2∶1
C:若生成0.2 mol HNO3,则转移0.2 mol电子
D:NF3在潮湿的空气中泄漏会产生红棕色气体
The plane had already taken off. So he decided ________the G109 Train to Shanghai.